Grinding Jars
The best grinding and mixing results are achieved by using the right peripheral speed for the grinding jar. KERA provides advice on and supplies wear-resistant grinding jars with volumes ranging from 1 to 15 litres in various models.
Alumina, zirconia, silicon, nitride, stainless steel and porcelain: discover our selection of grinding jars, all equipped with a perfectly fitting lid. We can also provide advice on which jars suits you and your application best.
| Diameter Ø mm | Height mm | Content ml | Sales unit |
| 135 | 182 | 1.000 | 1 |
| 150 | 222 | 1.700 | 1 |
| 200 | 240 | 3.000 | 1 |
| 225 | 280 | 5.000 | 1 |
| 288 | 333 | 10.000 | 1 |
| 335 | 360 | 15.000 | 1 |
Additional requests for grinding jars? We can supply containers that meet all your demands, including in terms of quality.
How many balls are needed for each jar?
See the table below to decide the perfect amount of filling and how many balls are needed for each jar,
| Content in litres | Ball diameter Ø mm |
| 9 | 15 | 20 | 30 | 40 | 50 | |
| 1 | 0,10 kg | 0,2 kg | 0,2 kg | |||
| 1,5 | 0,15 kg | 0,3 kg | 0,3 kg | |||
| 3 | 0,30 kg | 0,6 kg | 0,6 kg | |||
| 5 | 0,50 kg | 1,0 kg | 1,0 kg | |||
| 10 | 0,50 kg | 1,5 kg | 1,5 kg | 1,5 kg | ||
| 15 | 1,00 kg | 1,5 kg | 1,5 kg | 1,5 kg | 2,0 kg | |
| Number of balls per kg | 1080 | 230 | 95 | 30 | 12 | 6 |
CRITICAL SPEED
A proper grinding process requires the balls to be able to roll freely among the material. The peripheral speed of the grinding jar is a major parameter in this. Excessive speed will make the centrifugal force exceed gravity, causing the grinding material and media to stick to the inner wall of the container. This tipping point is known as the critical speed.
Depending on the product and desired processing, the optimal grinding speed lies between 50 and 70% of the critical speed.
Contact us for advice on the ideal critical speed for your grinding process and which jar would suit best.